Treatment Plant Operator magazine - Two Birds, One Stone

Faced with a future mandate to limit phosphorus and nitrogen discharged to Jordan Lake, the city of Mebane (N.C.) expected to upgrade its activated sludge plant to a biological nutrient

removal system. Interestingly though, effluent ammonia levels were below 1.0 mg/L, even though the aeration basin dissolved oxygen (DO ) was below the recommended 1.0-2.0 mg/L for nitrification. Because of the low DO , the plant was also removing some nitrates.

 

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